error when compiling program under xcode4.2

[exinhe]

i got the following error:error: expected a property attribute before
'strong'

nothing happens to the privious version,it works fine but behave
strangely in ipad,so i change to the new version.

thanks for your attention!

[exinhe]

i solve the problem by "find and replace in workspace",change all the
"strong" to "retain"